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Flow Chart of Troubleshooting
7-4
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PHONE Part
Phone ON
NG
4pin in U803
= High
YES
Check U900
Neighboring
Circuits
NO
1pin in U803
= High
YES
Check UCP800 &
Neighboring Circuits
NO
Output Powers
in U405 OK?
YES
NO
31pin in U900
=High
NO
Check U803
YES
2pin in U302
= High
Check UME300 &
Neighboring Circuits
NO
YES
Check U900
Neighboring
Circuits
Check UCP800 & OSC200
Neighboring Circuits